Sensor



FIG. 1 is a perspective view thereof;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof; and,

FIG. 5 is back elevational view thereof.

The broken lines show portions of a sensor that form no part of the claimed design. 

CLAIM The ornamental design for a sensor, as shown and described. 